<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>11.后盾人网站结构分析</title>
  <link rel="stylesheet" href="11.css">
</head>

<body>
  <header>
    <nav>
      <ul>
        <li>
          <a href="">系统过程</a>
        </li>
      </ul>
      <div class="button">
        <button>登陆</button>
      </div>
    </nav>
  </header>

  <main>
    <article></article>
    <aside></aside>
  </main>

  <footer>
    <div>
      我们的使命：传播互联网前沿技术，帮助更多的人实现梦想
    </div>
  </footer>
</body>

</html>